Unless the dev's have change it NetWait is hard coded you cannot change it if you was able to change it everyone with a slow connection would not get to play the first round.
You can change
Time spent in weapon selection and communication
BeginningOfRoundDelay=12

NetWait is the pause time at the start of a match for people with various connection speeds and hardware to load up the game and join. You may be thinking of something else, Delton. It definitely should be changeable.

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It will normally give the same result, as AAGame.ini is generated from DefaultGame.ini but its bad form as it will leave you with a possible corrupt default file and make it a bit harder to restore if anything goes wrong.
(instead of just deleting the user *.ini files and have the game recreate them you will have to download new default files, then have the game recreate them, not that hard but annoying)